CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash flows from operating activities:
Net loss	$ (172.2)	$ (194.5)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	15.3	15.2
Stock-based compensation	47.2	45.6
Amortization of premium on bonds	(4.5)	(1.3)
Provision for bad debt	7.9	6.0
Asset impairment charge	0.3	3.7
Changes in operating assets and liabilities:
Premium receivable	(83.6)	(49.6)
Reinsurance recoverable	(51.5)	12.2
Prepaid reinsurance premium	(58.4)	(33.1)
Deferred acquisition costs	(3.1)	(1.2)
Other assets	24.4	5.0
Unpaid loss and loss adjustment expense	31.9	(1.1)
Unearned premium	100.1	67.6
Trade payables	0.4	1.6
Funds held for reinsurance treaties	60.5	(4.9)
Deferred ceding commissions	17.5	(0.6)
Ceded premium payable	18.7	17.9
Other liabilities and accrued expenses	23.9	8.5
Net cash used in operating activities	(25.2)	(103.0)
Cash flows from investing activities:
Proceeds from short-term investments sold or matured	64.6	115.2
Proceeds from bonds sold or matured	269.9	300.0
Cost of short-term investments acquired	(49.0)	(71.5)
Cost of bonds acquired	(241.2)	(288.8)
Purchases of property and equipment	(6.2)	(6.8)
Net cash provided by investing activities	38.1	48.1
Cash flows from financing activities:
Proceeds from borrowings under financing agreement	70.5	9.3
Payments on borrowings under financing agreement	(18.0)	(1.6)
Proceeds from stock exercises	0.2	0.5
Net cash provided by financing activities	52.7	8.2
Effect of exchange rate changes on cash, cash equivalents and restricted cash	0.7	(1.7)
Net increase (decrease) in cash, cash equivalents and restricted cash	66.3	(48.4)
Cash, cash equivalents and restricted cash at beginning of period	271.5	286.5
Cash, cash equivalents and restricted cash at end of period	337.8	238.1
Supplemental disclosure of cash flow information:
Cash paid for income taxes	2.0	0.6
Cash paid for interest expense on borrowings under financing agreement	$ 2.4	$ 0.1